It's not as simple as all that (of course it's not), because the laws are a hodgepodge mess and punishing the ones who hire won't stop them from coming in the first place - the vast majority of undocumented immigrants came here legally, on temporary visas, and just stayed. It will, however, make it more difficult for them to stay. The ones crossing the southern border came here because of what they were told about us as the land of opportunity. If we want them to stop coming, we have to utilize foreign media to counteract this narrative.